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Summary of Significant Accounting Policies (Details 2) (Commodity contracts [Member], USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of product [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of product [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of product [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of product [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of installations and service [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of installations and service [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of installations and service [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Cost of installations and service [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Delivery and branch expenses [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Delivery and branch expenses [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Delivery and branch expenses [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Delivery and branch expenses [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Increase / decrease in fair value of derivative instruments [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Increase / decrease in fair value of derivative instruments [Member] | Jun. 30, 2012 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Increase / decrease in fair value of derivative instruments [Member] | Jun. 30, 2011 Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] Increase / decrease in fair value of derivative instruments [Member] | Jun. 30, 2012 Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Quoted Prices in Active Markets for Identical Assets Level 1 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant Other Observable Inputs Level 2 [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant Other Observable Inputs Level 2 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant Other Observable Inputs Level 2 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant Other Observable Inputs Level 2 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant Other Observable Inputs Level 2 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant Other Observable Inputs Level 2 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant Other Observable Inputs Level 2 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant Other Observable Inputs Level 2 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant unobservable Inputs Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant unobservable Inputs Level 3 [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant unobservable Inputs Level 3 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant unobservable Inputs Level 3 [Member] Fair asset and fair liability value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant unobservable Inputs Level 3 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant unobservable Inputs Level 3 [Member] Fair liability and fair asset value of derivative instruments [Member] Fair Value, Measurements, Recurring [Member] | Jun. 30, 2012 Significant unobservable Inputs Level 3 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member] | Sep. 30, 2011 Significant unobservable Inputs Level 3 [Member] Long-term derivative liabilities included in other long-term liabilities [Member] Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Assets, commodity contracts | $ 25,608 | $ 41,788 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,608 | $ 41,531 |  |  |  | $ 257 | $ 10,017 | $ 721 | $ 10,017 | $ 550 |  |  |  | $ 171 | $ 15,591 | $ 41,067 | $ 15,591 | $ 40,981 |  |  |  | $ 86 |  |  |  |  |  |  |  |
Derivative Liabilities, commodity contracts | (32,203) | (41,275) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (32,203) | (41,179) |  | (96) | (10,641) | (627) |  |  | (10,641) | (602) |  | (25) | (21,562) | (40,648) |  |  | (21,562) | (40,577) |  | (71) |  |  |  |  |  |  |  |
Amount of (Gain) or Loss Recognized, commodity contracts |  |  | $ 359 | $ (9,717) | $ 15,683 | $ (5,512) | $ (120) | $ (384) | $ (224) | $ (798) | $ 4 | $ (229) | $ (87) | $ (712) | $ 11,225 | $ 16,323 | $ 1,362 | $ (10,844) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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